Sealing assembly and bearing assembly

Abstract

The utility model relates to a sealing assembly and a bearing assembly. The sealing assembly comprises a sealing body, a main sealing lip is arranged at the radial inner end of the sealing body, the main sealing lip inclines towards the axial side and the radial inner side of the sealing body, the main sealing lip is provided with a contact sealing section with the preset axial length, and a contact sealing face is formed on the radial inner surface of the contact sealing section. The axial long contact sealing section increases the contact area of the main sealing lip and the bearing inner ring to form a longer sealing interface, so that external liquid coolants (such as cutting fluid, water and the like) can be more effectively prevented from invading, and the leakage risk is reduced. Meanwhile, the contact pressure can be effectively dispersed, the friction coefficient is reduced, the friction torque is reduced, the abrasion resistance of the contact sealing surface of the contact sealing section of the sealing body is improved, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of bearing sealing technology, and in particular to a sealing assembly and a bearing assembly. Background Technology

[0002] Figure 1 A typical rotating shaft sealing assembly for use in cold rolling mill bearings is shown. The sealing assembly comprises a metal skeleton 30 and a rubber component 40 attached thereto by a vulcanization process. The rubber component typically includes a primary sealing lip 41 and a secondary sealing lip 42. The primary sealing lip is equipped with a spring 50, primarily used to prevent external liquid coolant from seeping into the bearing, while the secondary sealing lip prevents grease leakage from inside the bearing.

[0003] Because these sealing components typically have a large diameter, they are more difficult to manufacture, leading to increased manufacturing costs. Furthermore, customer demand for this particular sealing component is relatively low; therefore, creating expensive molds specifically for a small number of products significantly increases the cost per sealing component. The high mold development costs, spread across a small production run, result in a substantial increase in the cost per sealing component. Therefore, it is necessary to find a sealing component that is easy to manufacture and has a low cost. Utility Model Content

[0004] To overcome the problems existing in the related technologies, this disclosure provides a sealing assembly and a bearing assembly.

[0005] According to a first aspect of the present disclosure, a sealing assembly is provided, including a sealing body, wherein a main sealing lip is provided at the radially inner end of the sealing body, the main sealing lip being inclined toward one axial side and the radially inner side of the sealing body, wherein the main sealing lip has a contact sealing section of a predetermined axial length, and the radially inner surface of the contact sealing section forms a contact sealing surface.

[0006] In some embodiments, the sealing body is integrally molded from thermoplastic polyurethane rubber material by machining.

[0007] In some embodiments, the contact sealing surface is provided with multiple first grooves arranged at intervals along the axial direction.

[0008] In some embodiments, the sealing assembly includes a first spring ring and a second spring ring, the first spring ring and the second spring ring being pressed together on the radial outer wall of the contact sealing section of the main sealing lip, wherein the second spring ring is located at one axial end of the main sealing lip, and the inner diameter of the first spring ring is larger than the inner diameter of the second spring ring and is located at the other axial end of the main sealing lip.

[0009] In some embodiments, the cross-sectional diameter of the first spring coil is larger than the cross-sectional diameter of the second spring coil.

[0010] In some embodiments, the radial outer wall of the contact sealing section of the main sealing lip is provided with two fixing grooves, which are used to install the first spring ring and the second spring ring, respectively.

[0011] In some embodiments, a secondary sealing lip is provided at the radially inner end of the sealing body. The secondary sealing lip is located on the axial side of the main sealing lip and is inclined toward the axial side and radially inner side of the sealing body.

[0012] In some embodiments, the sealing body includes an axial first end face and an axial second end face, and the main sealing lip and the secondary sealing lip are located within an axial length range between the axial first end face and the axial second end face.

[0013] In some embodiments, the radial outer wall of the sealing body is provided with a plurality of circular second grooves arranged side by side along the axial direction.

[0014] According to a second aspect of the present disclosure, a bearing assembly is provided, comprising: an inner ring; an outer ring; a sealing ring disposed on one axial side of the outer ring and forming a clamping groove; and a sealing assembly as described in the first aspect, wherein the radially outer end of the sealing assembly is clamped axially within the clamping groove and is torsionally connected to the outer ring, the main sealing lip is interference-fitted with the outer wall of the inner ring and forms a dynamic seal, and the secondary sealing lip abuts or clearance-fits with the outer wall of the inner ring.

[0015] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: the axially longer contact sealing section increases the contact area between the main sealing lip and the inner ring of the bearing, forming a longer sealing interface, which can more effectively block the intrusion of external liquid coolants (such as cutting fluid, water, etc.) and reduce the risk of leakage. At the same time, it can also effectively disperse contact pressure, reduce the coefficient of friction, reduce friction torque, and improve the wear resistance and service life of the contact sealing surface of the contact sealing section of the seal body. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0017] Figure 1 This is a cross-sectional view of a sealing component in related technologies;

[0018] Figure 2 This is a cross-sectional view of a sealing assembly according to an exemplary embodiment. Detailed Implementation

[0019] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0020] In this invention, unless otherwise stated, axial direction A and radial direction R refer to axial direction A and radial direction R, respectively; one side of the axial direction or one end of the axial direction refers to... Figure 2 The right side (e.g., the side where air is located), the other side of the axis or the other end of the axis refers to Figure 2 The left side (e.g., the side where the bearing is located); the radial outer side or radial outer end refers to Figure 2 The upper side, radial inner side, or radial inner end refers to Figure 2 The lower side of the middle. Additionally, the term "torsional connection" refers to a connection between two elements that does not rotate relative to each other, which can be achieved via a press fit (i.e., an interference fit) or by integrally forming the two components mentioned. Those skilled in the art will understand the specific meaning of the above terms in this invention as appropriate.

[0021] To solve the above-mentioned technical problems, this disclosure provides a sealing assembly 100, such as... Figure 2 As shown, the sealing assembly 100 includes a sealing body 10 and a spring ring 20. The sealing body 10 is made of thermoplastic polyurethane rubber material (hereinafter referred to as TPU) and is integrally molded by machining.

[0022] Conventional sealing components 100 typically require a metal skeleton to enhance structural strength, while the sealing body 10 of this disclosure is made entirely of a single TPU material. The TPU material maintains high elasticity within a hardness range from Shore A 60 to Shore D 80, ensuring that the sealing body 10 made of TPU material possesses both structural strength and good elasticity, meeting sealing requirements. Furthermore, as... Figure 2 As can be seen from the cross-section of the sealing body 10 shown, the axial dimension of the sealing body 10 is relatively large, which also enables the sealing body 10 to have sufficient rigidity and not easily deformed.

[0023] The sealing assembly 100 disclosed herein eliminates the need for a metal frame, reduces the number of parts, and simplifies the structure of the sealing assembly 100. Since the sealing body 10 is made of TPU material and integrally molded by machining, the sealing assembly 100 eliminates the need for stamping dies and vulcanizing dies during production, reducing manufacturing process steps. Therefore, by eliminating complex molds and process steps, it is particularly suitable for small-batch production or customer customization needs, significantly reducing production costs.

[0024] Furthermore, TPU material retains its flexibility over a wide temperature range of -40℃ to 120℃, eliminating the need for plasticizers and ensuring that the resulting seal 10 effectively prevents seal failure, thus improving reliability in extreme environments. TPU material exhibits excellent oil resistance and resistance to many solvents, ensuring that the resulting seal 10 can be used long-term in environments exposed to chemicals. TPU material also possesses excellent weather resistance, resisting the effects of natural environmental factors such as ultraviolet radiation and ozone, further increasing the reliability of the seal 10 made from it. TPU material also possesses well-known excellent abrasion resistance, tear resistance, and flexural strength; its high tensile strength, high elongation, and low long-term compression set ensure that the seal 10 made from TPU material not only has a long service life but also guarantees its stability under high-stress environments.

[0025] Furthermore, from such Figure 2 As can be seen from the cross-section of the sealing body 10 shown, along the axial direction A, the sealing body 10 includes an axial first end face 15 and an axial second end face 14. The axial length of the sealing body 10 is relatively large, and the main sealing lip 11 and the secondary sealing lip 12 described below are both located within the axial length range between the axial first end face 15 and the axial second end face 14 along the axial direction A.

[0026] The main sealing lip 11 and the secondary sealing lip 12 do not extend beyond the outer side of the axial first end face and the axial second end face of the sealing body 10. This prevents stress concentration at the root of the sealing lip due to an excessively long cantilever structure (especially under high-speed rotation or vibration conditions), reducing the risk of sealing lip breakage. The large axial length of the sealing body 10 provides sufficient elastomeric material support at the root of the main sealing lip 11 and the secondary sealing lip 12, enhancing the overall resistance to deformation.

[0027] In addition, the main sealing lip 11 and the secondary sealing lip 12 are completely built into the axial range of the sealing body 10, avoiding scratches or folding caused by exposed sealing lips during installation (e.g., interference with the housing edge when press-fitting bearings). Furthermore, it can accommodate bearing cavities with limited axial space without requiring additional space for the sealing lips to extend outwards.

[0028] When the sealing assembly 100 is applied to a bearing assembly, particularly to a cold rolling mill bearing, the cold rolling mill bearing includes at least an outer ring 200, an inner ring 300, and a sealing ring 400. The sealing ring 400 is fixedly connected to one axial side of the outer ring 200 and together with the axial end face of the outer ring 200 forms a clamping groove 401. When the sealing ring 400 is fixedly connected to one axial side of the outer ring 200 along axial direction A, the radially outer end of the sealing assembly 100 is clamped in the clamping groove 401 along axial direction A. Specifically, the radially outer end of the sealing assembly 100 is clamped between one axial side of the outer ring 200 and the sealing ring 400. The axial second end face 14 and the axial first end face 15 of the sealing body 10 are clamped and contacted with the sealing ring 400 and the outer ring 200, respectively. Meanwhile, the outer radial end of the sealing body 10 is also interference-fitted with the inner radial wall of the sealing ring 400, which not only ensures that the sealing body 10 is firmly fixed on the outer ring 200, but also enables the sealing body 10 to form an anti-torsional connection with the outer ring 200, so that it can rotate relative to the inner ring 300 together with the outer ring 200.

[0029] Furthermore, the radial outer wall of the sealing body 10 is provided with a plurality of circular second grooves 16 arranged side by side along the axial direction A. Specifically, there are several circular second grooves 16 on the radial outer end face of the sealing body 10. The circular second grooves 16 make it easier for the radial outer end face of the sealing body 10 to be compressed and deformed, ensuring that the sealing body 10 and the radial inner wall of the sealing ring 400 are more easily press-fitted, so that the sealing body 10 can better fit tightly against the radial inner wall of the sealing ring 400.

[0030] Furthermore, the circular second groove 16 increases the contact area between the sealing body 10 and the sealing ring 400, forming multiple sealing barriers along the axial direction A. This effectively prevents the leakage of lubricating grease from the radial second end face of the sealing body 10, significantly improving the overall sealing performance of the sealing assembly 100. The circular second groove 16 also increases the frictional force during the radial inner wall press-fit between the sealing body 10 and the sealing ring 400, helping to prevent displacement or loosening of the sealing body 10.

[0031] Furthermore, the inner radial end of the sealing body 10 is provided with a main sealing lip 11 and a secondary sealing lip 12.

[0032] like Figure 2As shown, the main sealing lip 11 extends obliquely towards the axial side and radially inward side of the sealing body 10. The main sealing lip 11 can extend a considerable distance axially, forming a contact sealing section 111 of a predetermined length in the axial direction A. The radially inner surface of the contact sealing section 111 constitutes a contact sealing surface 112. When the sealing assembly 100 of this disclosure is applied to a bearing, the contact sealing surface 112 of the contact sealing section 111 of the main sealing lip 11 abuts against the rotating surface of the bearing inner ring 300, thereby forming a dynamic sealing contact with the outer wall of the bearing inner ring 300. With the main sealing lip 11 facing the air side, i.e., the outer side of the bearing, the axially longer contact sealing section 111 increases the contact area between the main sealing lip 11 and the bearing inner ring 300, forming a longer sealing interface. This more effectively prevents the intrusion of external liquid coolants (such as cutting fluid, water, etc.), reducing the risk of leakage.

[0033] In addition, the longer contact sealing section 111 allows the main sealing lip 11 to maintain a more stable contact pressure distribution when the bearing inner ring 300 rotates, reducing seal failure caused by shaft runout or eccentricity.

[0034] The secondary sealing lip 12 is located on the opposite side of the main sealing lip 11 along the axial direction, and is inclined toward the opposite side of the sealing body 10 along the axial direction and radially inward. When the sealing assembly 100 is applied to a bearing, the secondary sealing lip 12 faces the side of the bearing with lubricating grease, and the secondary sealing lip 12 makes light contact or clearance contact with the inner ring 300 of the bearing to prevent leakage of lubricating grease inside the bearing.

[0035] Furthermore, the contact sealing surface 112 is provided with multiple first grooves 113 arranged at intervals along the axial direction. These first grooves 113 not only help to reduce the frictional torque when the contact sealing surface 112 and the bearing inner ring 300 dynamically seal against each other, but also store trace amounts of coolant that have intruded from the outside of the bearing, thereby slowing down the rate at which coolant enters the bearing.

[0036] Furthermore, multiple first grooves 113 can be arranged side by side at intervals in the axial direction to form parallel annular first grooves 113. In this way, the contact pressure can be effectively dispersed, the coefficient of friction can be reduced, the friction torque can be reduced, and the wear resistance and service life of the contact sealing surface 112 of the contact sealing section 111 of the sealing body 10 can be improved.

[0037] In some embodiments, the sealing assembly 100 includes a first spring ring 21 and a second spring ring 22, which are pressed together on the radial outer wall of the contact sealing section 111 of the main sealing lip 11. The second spring ring 22 is located at one axial end of the main sealing lip 11, near the end of the main sealing lip 11, and the inner diameter of the first spring ring 21 is larger than the inner diameter of the second spring ring 22 and is located at the other axial end of the main sealing lip 11.

[0038] The second spring ring 22 provides a high initial pressure during the initial use of the sealing assembly 100, ensuring a tight initial contact between the contact sealing surface 112 of the main sealing lip 11 and the rotating surface of the bearing inner ring 300. As the sealing assembly 100 is used for a longer period and the main sealing lip 11 experiences slight wear, the second spring ring 22 gradually releases its elastic potential energy, maintaining the sealing effect between the main sealing lip 11 and the rotating surface of the bearing inner ring 300.

[0039] The first spring ring 21 can provide continuous pressure compensation, especially when the main sealing lip 11 experiences initial wear. The first spring ring 21 will gradually release more elastic potential energy, further ensuring that the main sealing lip 11 always maintains good contact with the rotating surface of the bearing inner ring 300.

[0040] Through the combined action of the first spring ring 21 and the second spring ring 22, not only is the insufficient elasticity of TPU material compared to rubber material resolved, but a dynamic pressure regulation mechanism is also provided, which can automatically adjust the pressure distribution at different stages of sealing lip wear. The second spring ring 22 provides high initial pressure in the early stages, while the first spring ring 21 provides continuous pressure compensation in the later stages, ensuring that the sealing assembly 100 maintains good sealing performance throughout its entire lifespan, and the sealing effect does not decrease due to the wear of the main sealing lip 11.

[0041] In some embodiments, the cross-sectional diameter of the first spring ring 21 is larger than that of the second spring ring 22. Because the first spring ring 21 has a larger cross-sectional diameter, it can provide stronger elasticity and greater radial compressive force, enabling it to provide sufficient pressure compensation even when the main sealing lip 11 is severely worn, ensuring that the main sealing lip 11 always maintains good dynamic sealing contact with the rotating surface of the bearing inner ring 300.

[0042] Furthermore, the radial outer wall of the contact sealing section 111 of the main sealing lip 11 is provided with two fixing grooves 114, which are used to install the first spring ring 21 and the second spring ring 22, respectively.

[0043] The radial outer wall of the contact sealing section 111 of the main sealing lip 11 is provided with two fixing grooves 114, one for installing the first spring ring 21 and the other for installing the second spring ring 22. In this way, not only is the accurate installation position of the two spring rings ensured, but a stable support structure is also provided to prevent the first spring ring 21 and the second spring ring 22 from shifting or loosening during operation.

[0044] In some other embodiments, multiple spring coils 20 may also be provided, which are not specifically limited here.

[0045] Based on the same inventive concept, this disclosure provides a bearing assembly applicable to cold rolling mills. The specific manner in which the functions of the bearing assembly in the above embodiments are implemented has been described in detail in the embodiments relating to the sealing assembly 100, and will not be elaborated upon here.

[0046] It is further understood that the terms “horizontal,” “front,” “rear,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0047] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0048] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A sealing assembly (100), characterized in that, Includes a sealing body (10). The sealing body (10) has a main sealing lip (11) at its radial inner end. The main sealing lip (11) is inclined toward the axial side and radial inner side of the sealing body (10). The main sealing lip (11) has a contact sealing section (111) of a preset axial length. The radial inner surface of the contact sealing section (111) forms a contact sealing surface (112). The sealing body (10) is integrally formed from thermoplastic polyurethane rubber material by machining.

2. The sealing assembly (100) according to claim 1, characterized in that, The contact sealing surface (112) is provided with multiple first grooves (113) arranged at intervals along the axial direction (A).

3. The sealing assembly (100) according to claim 1, characterized in that, The sealing assembly (100) includes a first spring ring (21) and a second spring ring (22), which are pressed together on the radial outer wall of the contact sealing section (111) of the main sealing lip (11). The second spring ring (22) is located at one axial end of the main sealing lip (11), and the inner diameter of the first spring ring (21) is larger than the inner diameter of the second spring ring (22) and is located at the other axial end of the main sealing lip (11).

4. The sealing assembly (100) according to claim 3, characterized in that, The cross-sectional diameter of the first spring coil (21) is larger than the cross-sectional diameter of the second spring coil (22).

5. The sealing assembly (100) according to claim 3, characterized in that, The radial outer wall of the contact sealing section (111) of the main sealing lip (11) is provided with two fixing grooves (114), which are used to install the first spring ring (21) and the second spring ring (22), respectively.

6. The sealing assembly (100) according to claim 1, characterized in that, The sealing body (10) has a secondary sealing lip (12) at its radial inner end. The secondary sealing lip (12) is located on the other side of the axial direction of the main sealing lip (11). The secondary sealing lip (12) is inclined toward the other side of the axial direction and the radial inner direction of the sealing body (10).

7. The sealing assembly (100) according to claim 6, characterized in that, The sealing body (10) includes an axial first end face (15) and an axial second end face (14), and the main sealing lip (11) and the secondary sealing lip (12) are located within the axial length range between the axial first end face (15) and the axial second end face (14).

8. The sealing assembly (100) according to claim 1, characterized in that, The outer radial wall of the sealing body (10) is provided with a plurality of circular second grooves (16) arranged side by side along the axial direction.

9. A bearing assembly, characterized in that, include: Inner circle (300); Outer ring (200); A sealing ring (400) is disposed on one axial side of the outer ring (200) and forms a clamping groove (401) together with the axial end face of the outer ring (200); and The sealing assembly (100) as described in any one of claims 1 to 8. The outer radial end of the sealing assembly (100) is clamped in the clamping groove (401) along the axial direction and is anti-torsional connected to the outer ring (200). The main sealing lip (11) is interference-fitted with the outer wall of the inner ring (300) and forms a dynamic sealing contact. The secondary sealing lip (12) is in contact with or clearance-fitted with the outer wall of the inner ring (300).

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